Gear Ratio & RPM
Engine RPM, gear ratio, final drive, and tire diameter into vehicle speed
mph = engineRpm × π × tireDia × 0.0254 × 60 / (gear × diff × 1609.344)
Speed (mph)
65.4
Speed (km/h)
105.2
Final drive
3.55
Wheel RPM
845
Engine RPM, gear ratio, final drive, and tire diameter into vehicle speed